Rain lilies are real wild flowers, they bloom under certain natural conditions, usually in rainy season, but sporadically at other times too.
Some believe you can force them to bloom by dry and wet periods.

I love them. The best place to shop new variety of rain lilies is www.plantdelights.com. There are so many variations in the pink, white and red now. Maybe we can ask Dr amer to buy some for us, they multiply easily.